I tried the well-reviewed and expensive Moment lenses on an iPhone 6 Plus. Meh.
My primary use was for video. These add-on lenses often confused the iPhone automatic focus/exposure/white balance, which I use (too) often. They worked well for still photos.
One major annoyance for me was the Moment glued-on lens mount. They were challenging to apply just so over the lens. But the worst part: sharp edges literally wore a hole in my pockets. Since I’d stopped using the lenses anyway, I peeled off the mount with some struggle. If you can tolerate an iPhone case, the Moment case with lens mount might be the way to go.
I decided that dragging along a dedicated camera was better if I wanted better video. So that’s what I do.
YMMV.
— Rex